[PATCH 11/15] mm: cleanup the hmm_vma_handle_pmd stub

[Christoph Hellwig]

Stub out the whole function when CONFIG_TRANSPARENT_HUGEPAGE is not set
to make the function easier to read.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 mm/hmm.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index 5e7afe685213..4aa7135f1094 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -455,13 +455,10 @@ static inline uint64_t pmd_to_hmm_pfn_flags(struct hmm_range *range, pmd_t pmd)
 				range->flags[HMM_PFN_VALID];
 }
 
-static int hmm_vma_handle_pmd(struct mm_walk *walk,
-			      unsigned long addr,
-			      unsigned long end,
-			      uint64_t *pfns,
-			      pmd_t pmd)
-{
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
+		unsigned long end, uint64_t *pfns, pmd_t pmd)
+{
 	struct hmm_vma_walk *hmm_vma_walk = walk->private;
 	struct hmm_range *range = hmm_vma_walk->range;
 	struct dev_pagemap *pgmap = NULL;
@@ -490,11 +487,12 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk,
 		put_dev_pagemap(pgmap);
 	hmm_vma_walk->last = end;
 	return 0;
-#else
-	/* If THP is not enabled then we should never reach this code ! */
-	return -EINVAL;
-#endif
 }
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+/* stub to allow the code below to compile */
+int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
+		unsigned long end, uint64_t *pfns, pmd_t pmd);
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 static inline uint64_t pte_to_hmm_pfn_flags(struct hmm_range *range, pte_t pte)
 {
-- 
2.20.1